In a large bowl, cream butter and sugar until light and fluffy. Beat in egg and vanilla. Combine flour, baking soda and salt; gradually add to the creamed mixture. Stir in candy bars.
Drop by rounded teaspoonfuls 2 in. apart onto greased baking sheets. Bake at 350° for 10 minutes or until edges are lightly browned. Immediately remove to wire racks to cool.
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